diff options
Diffstat (limited to 'drivers/infiniband/hw/ipath/ipath_rc.c')
| -rw-r--r-- | drivers/infiniband/hw/ipath/ipath_rc.c | 899 |
1 files changed, 365 insertions, 534 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_rc.c b/drivers/infiniband/hw/ipath/ipath_rc.c index 493b1821a934..774d1615ce2f 100644 --- a/drivers/infiniband/hw/ipath/ipath_rc.c +++ b/drivers/infiniband/hw/ipath/ipath_rc.c @@ -1,4 +1,5 @@ /* + * Copyright (c) 2006 QLogic, Inc. All rights reserved. * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved. * * This software is available to you under a choice of one of two @@ -31,7 +32,7 @@ */ #include "ipath_verbs.h" -#include "ips_common.h" +#include "ipath_common.h" /* cut down ridiculously long IB macro names */ #define OP(x) IB_OPCODE_RC_##x @@ -41,14 +42,14 @@ * @qp: the QP who's SGE we're restarting * @wqe: the work queue to initialize the QP's SGE from * - * The QP s_lock should be held. + * The QP s_lock should be held and interrupts disabled. */ static void ipath_init_restart(struct ipath_qp *qp, struct ipath_swqe *wqe) { struct ipath_ibdev *dev; u32 len; - len = ((qp->s_psn - wqe->psn) & IPS_PSN_MASK) * + len = ((qp->s_psn - wqe->psn) & IPATH_PSN_MASK) * ib_mtu_enum_to_int(qp->path_mtu); qp->s_sge.sge = wqe->sg_list[0]; qp->s_sge.sg_list = wqe->sg_list + 1; @@ -72,11 +73,10 @@ static void ipath_init_restart(struct ipath_qp *qp, struct ipath_swqe *wqe) * Return bth0 if constructed; otherwise, return 0. * Note the QP s_lock must be held. */ -static inline u32 ipath_make_rc_ack(struct ipath_qp *qp, - struct ipath_other_headers *ohdr, - u32 pmtu) +u32 ipath_make_rc_ack(struct ipath_qp *qp, + struct ipath_other_headers *ohdr, + u32 pmtu) { - struct ipath_sge_state *ss; u32 hwords; u32 len; u32 bth0; @@ -90,13 +90,12 @@ static inline u32 ipath_make_rc_ack(struct ipath_qp *qp, */ switch (qp->s_ack_state) { case OP(RDMA_READ_REQUEST): - ss = &qp->s_rdma_sge; + qp->s_cur_sge = &qp->s_rdma_sge; len = qp->s_rdma_len; if (len > pmtu) { len = pmtu; qp->s_ack_state = OP(RDMA_READ_RESPONSE_FIRST); - } - else + } else qp->s_ack_state = OP(RDMA_READ_RESPONSE_ONLY); qp->s_rdma_len -= len; bth0 = qp->s_ack_state << 24; @@ -108,7 +107,7 @@ static inline u32 ipath_make_rc_ack(struct ipath_qp *qp, qp->s_ack_state = OP(RDMA_READ_RESPONSE_MIDDLE); /* FALLTHROUGH */ case OP(RDMA_READ_RESPONSE_MIDDLE): - ss = &qp->s_rdma_sge; + qp->s_cur_sge = &qp->s_rdma_sge; len = qp->s_rdma_len; if (len > pmtu) len = pmtu; @@ -127,41 +126,50 @@ static inline u32 ipath_make_rc_ack(struct ipath_qp *qp, * We have to prevent new requests from changing * the r_sge state while a ipath_verbs_send() * is in progress. - * Changing r_state allows the receiver - * to continue processing new packets. - * We do it here now instead of above so - * that we are sure the packet was sent before - * changing the state. */ - qp->r_state = OP(RDMA_READ_RESPONSE_LAST); qp->s_ack_state = OP(ACKNOWLEDGE); - return 0; + bth0 = 0; + goto bail; case OP(COMPARE_SWAP): case OP(FETCH_ADD): - ss = NULL; + qp->s_cur_sge = NULL; len = 0; - qp->r_state = OP(SEND_LAST); - qp->s_ack_state = OP(ACKNOWLEDGE); - bth0 = IB_OPCODE_ATOMIC_ACKNOWLEDGE << 24; + /* + * Set the s_ack_state so the receive interrupt handler + * won't try to send an ACK (out of order) until this one + * is actually sent. + */ + qp->s_ack_state = OP(RDMA_READ_RESPONSE_LAST); + bth0 = OP(ATOMIC_ACKNOWLEDGE) << 24; ohdr->u.at.aeth = ipath_compute_aeth(qp); - ohdr->u.at.atomic_ack_eth = cpu_to_be64(qp->s_ack_atomic); + ohdr->u.at.atomic_ack_eth = cpu_to_be64(qp->r_atomic_data); hwords += sizeof(ohdr->u.at) / 4; break; default: /* Send a regular ACK. */ - ss = NULL; + qp->s_cur_sge = NULL; len = 0; - qp->s_ack_state = OP(ACKNOWLEDGE); - bth0 = qp->s_ack_state << 24; - ohdr->u.aeth = ipath_compute_aeth(qp); + /* + * Set the s_ack_state so the receive interrupt handler + * won't try to send an ACK (out of order) until this one + * is actually sent. + */ + qp->s_ack_state = OP(RDMA_READ_RESPONSE_LAST); + bth0 = OP(ACKNOWLEDGE) << 24; + if (qp->s_nak_state) + ohdr->u.aeth = cpu_to_be32((qp->r_msn & IPATH_MSN_MASK) | + (qp->s_nak_state << + IPATH_AETH_CREDIT_SHIFT)); + else + ohdr->u.aeth = ipath_compute_aeth(qp); hwords++; } qp->s_hdrwords = hwords; - qp->s_cur_sge = ss; qp->s_cur_size = len; +bail: return bth0; } @@ -174,11 +182,11 @@ static inline u32 ipath_make_rc_ack(struct ipath_qp *qp, * @bth2p: pointer to the BTH PSN word * * Return 1 if constructed; otherwise, return 0. - * Note the QP s_lock must be held. + * Note the QP s_lock must be held and interrupts disabled. */ -static inline int ipath_make_rc_req(struct ipath_qp *qp, - struct ipath_other_headers *ohdr, - u32 pmtu, u32 *bth0p, u32 *bth2p) +int ipath_make_rc_req(struct ipath_qp *qp, + struct ipath_other_headers *ohdr, + u32 pmtu, u32 *bth0p, u32 *bth2p) { struct ipath_ibdev *dev = to_idev(qp->ibqp.device); struct ipath_sge_state *ss; @@ -257,7 +265,7 @@ static inline int ipath_make_rc_req(struct ipath_qp *qp, break; case IB_WR_RDMA_WRITE: - if (newreq) + if (newreq && qp->s_lsn != (u32) -1) qp->s_lsn++; /* FALLTHROUGH */ case IB_WR_RDMA_WRITE_WITH_IMM: @@ -283,8 +291,7 @@ static inline int ipath_make_rc_req(struct ipath_qp *qp, else { qp->s_state = OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE); - /* Immediate data comes - * after RETH */ + /* Immediate data comes after RETH */ ohdr->u.rc.imm_data = wqe->wr.imm_data; hwords += 1; if (wqe->wr.send_flags & IB_SEND_SOLICITED) @@ -304,7 +311,8 @@ static inline int ipath_make_rc_req(struct ipath_qp *qp, qp->s_state = OP(RDMA_READ_REQUEST); hwords += sizeof(ohdr->u.rc.reth) / 4; if (newreq) { - qp->s_lsn++; + if (qp->s_lsn != (u32) -1) + qp->s_lsn++; /* * Adjust s_next_psn to count the * expected number of responses. @@ -335,7 +343,8 @@ static inline int ipath_make_rc_req(struct ipath_qp *qp, wqe->wr.wr.atomic.compare_add); hwords += sizeof(struct ib_atomic_eth) / 4; if (newreq) { - qp->s_lsn++; + if (qp->s_lsn != (u32) -1) + qp->s_lsn++; wqe->lpsn = wqe->psn; } if (++qp->s_cur == qp->s_size) @@ -352,9 +361,14 @@ static inline int ipath_make_rc_req(struct ipath_qp *qp, if (qp->s_tail >= qp->s_size) qp->s_tail = 0; } - bth2 |= qp->s_psn++ & IPS_PSN_MASK; + bth2 |= qp->s_psn++ & IPATH_PSN_MASK; if ((int)(qp->s_psn - qp->s_next_psn) > 0) qp->s_next_psn = qp->s_psn; + /* + * Put the QP on the pending list so lost ACKs will cause + * a retry. More than one request can be pending so the + * QP may already be on the dev->pending list. + */ spin_lock(&dev->pending_lock); if (list_empty(&qp->timerwait)) list_add_tail(&qp->timerwait, @@ -364,8 +378,8 @@ static inline int ipath_make_rc_req(struct ipath_qp *qp, case OP(RDMA_READ_RESPONSE_FIRST): /* - * This case can only happen if a send is restarted. See - * ipath_restart_rc(). + * This case can only happen if a send is restarted. + * See ipath_restart_rc(). */ ipath_init_restart(qp, wqe); /* FALLTHROUGH */ @@ -373,7 +387,7 @@ static inline int ipath_make_rc_req(struct ipath_qp *qp, qp->s_state = OP(SEND_MIDDLE); /* FALLTHROUGH */ case OP(SEND_MIDDLE): - bth2 = qp->s_psn++ & IPS_PSN_MASK; + bth2 = qp->s_psn++ & IPATH_PSN_MASK; if ((int)(qp->s_psn - qp->s_next_psn) > 0) qp->s_next_psn = qp->s_psn; ss = &qp->s_sge; @@ -415,7 +429,7 @@ static inline int ipath_make_rc_req(struct ipath_qp *qp, qp->s_state = OP(RDMA_WRITE_MIDDLE); /* FALLTHROUGH */ case OP(RDMA_WRITE_MIDDLE): - bth2 = qp->s_psn++ & IPS_PSN_MASK; + bth2 = qp->s_psn++ & IPATH_PSN_MASK; if ((int)(qp->s_psn - qp->s_next_psn) > 0) qp->s_next_psn = qp->s_psn; ss = &qp->s_sge; @@ -452,7 +466,7 @@ static inline int ipath_make_rc_req(struct ipath_qp *qp, * See ipath_restart_rc(). */ ipath_init_restart(qp, wqe); - len = ((qp->s_psn - wqe->psn) & IPS_PSN_MASK) * pmtu; + len = ((qp->s_psn - wqe->psn) & IPATH_PSN_MASK) * pmtu; ohdr->u.rc.reth.vaddr = cpu_to_be64(wqe->wr.wr.rdma.remote_addr + len); ohdr->u.rc.reth.rkey = @@ -460,7 +474,7 @@ static inline int ipath_make_rc_req(struct ipath_qp *qp, ohdr->u.rc.reth.length = cpu_to_be32(qp->s_len); qp->s_state = OP(RDMA_READ_REQUEST); hwords += sizeof(ohdr->u.rc.reth) / 4; - bth2 = qp->s_psn++ & IPS_PSN_MASK; + bth2 = qp->s_psn++ & IPATH_PSN_MASK; if ((int)(qp->s_psn - qp->s_next_psn) > 0) qp->s_next_psn = qp->s_psn; ss = NULL; @@ -496,189 +510,169 @@ done: return 0; } -static inline void ipath_make_rc_grh(struct ipath_qp *qp, - struct ib_global_route *grh, - u32 nwords) -{ - struct ipath_ibdev *dev = to_idev(qp->ibqp.device); - - /* GRH header size in 32-bit words. */ - qp->s_hdrwords += 10; - qp->s_hdr.u.l.grh.version_tclass_flow = - cpu_to_be32((6 << 28) | - (grh->traffic_class << 20) | - grh->flow_label); - qp->s_hdr.u.l.grh.paylen = - cpu_to_be16(((qp->s_hdrwords - 12) + nwords + - SIZE_OF_CRC) << 2); - /* next_hdr is defined by C8-7 in ch. 8.4.1 */ - qp->s_hdr.u.l.grh.next_hdr = 0x1B; - qp->s_hdr.u.l.grh.hop_limit = grh->hop_limit; - /* The SGID is 32-bit aligned. */ - qp->s_hdr.u.l.grh.sgid.global.subnet_prefix = dev->gid_prefix; - qp->s_hdr.u.l.grh.sgid.global.interface_id = - ipath_layer_get_guid(dev->dd); - qp->s_hdr.u.l.grh.dgid = grh->dgid; -} - /** - * ipath_do_rc_send - perform a send on an RC QP - * @data: contains a pointer to the QP + * send_rc_ack - Construct an ACK packet and send it + * @qp: a pointer to the QP * - * Process entries in the send work queue until credit or queue is - * exhausted. Only allow one CPU to send a packet per QP (tasklet). - * Otherwise, after we drop the QP s_lock, two threads could send - * packets out of order. + * This is called from ipath_rc_rcv() and only uses the receive + * side QP state. + * Note that RDMA reads are handled in the send side QP state and tasklet. */ -void ipath_do_rc_send(unsigned long data) +static void send_rc_ack(struct ipath_qp *qp) { - struct ipath_qp *qp = (struct ipath_qp *)data; struct ipath_ibdev *dev = to_idev(qp->ibqp.device); - unsigned long flags; u16 lrh0; - u32 nwords; - u32 extra_bytes; u32 bth0; - u32 bth2; - u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu); + u32 hwords; + struct ipath_ib_header hdr; struct ipath_other_headers *ohdr; - if (test_and_set_bit(IPATH_S_BUSY, &qp->s_flags)) - goto bail; - - if (unlikely(qp->remote_ah_attr.dlid == - ipath_layer_get_lid(dev->dd))) { - struct ib_wc wc; - - /* - * Pass in an uninitialized ib_wc to be consistent with - * other places where ipath_ruc_loopback() is called. - */ - ipath_ruc_loopback(qp, &wc); - goto clear; - } - - ohdr = &qp->s_hdr.u.oth; - if (qp->remote_ah_attr.ah_flags & IB_AH_GRH) - ohdr = &qp->s_hdr.u.l.oth; - -again: - /* Check for a constructed packet to be sent. */ - if (qp->s_hdrwords != 0) { - /* - * If no PIO bufs are available, return. An interrupt will - * call ipath_ib_piobufavail() when one is available. - */ - _VERBS_INFO("h %u %p\n", qp->s_hdrwords, &qp->s_hdr); - _VERBS_INFO("d %u %p %u %p %u %u %u %u\n", qp->s_cur_size, - qp->s_cur_sge->sg_list, - qp->s_cur_sge->num_sge, - qp->s_cur_sge->sge.vaddr, - qp->s_cur_sge->sge.sge_length, - qp->s_cur_sge->sge.length, - qp->s_cur_sge->sge.m, - qp->s_cur_sge->sge.n); - if (ipath_verbs_send(dev->dd, qp->s_hdrwords, - (u32 *) &qp->s_hdr, qp->s_cur_size, - qp->s_cur_sge)) { - ipath_no_bufs_available(qp, dev); - goto bail; - } - dev->n_unicast_xmit++; - /* Record that we sent the packet and s_hdr is empty. */ - qp->s_hdrwords = 0; - } - - /* - * The lock is needed to synchronize between setting - * qp->s_ack_state, resend timer, and post_send(). - */ - spin_lock_irqsave(&qp->s_lock, flags); - - /* Sending responses has higher priority over sending requests. */ - if (qp->s_ack_state != OP(ACKNOWLEDGE) && - (bth0 = ipath_make_rc_ack(qp, ohdr, pmtu)) != 0) - bth2 = qp->s_ack_psn++ & IPS_PSN_MASK; - else if (!ipath_make_rc_req(qp, ohdr, pmtu, &bth0, &bth2)) - goto done; - - spin_unlock_irqrestore(&qp->s_lock, flags); - /* Construct the header. */ - extra_bytes = (4 - qp->s_cur_size) & 3; - nwords = (qp->s_cur_size + extra_bytes) >> 2; - lrh0 = IPS_LRH_BTH; + ohdr = &hdr.u.oth; + lrh0 = IPATH_LRH_BTH; + /* header size in 32-bit words LRH+BTH+AETH = (8+12+4)/4. */ + hwords = 6; if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { - ipath_make_rc_grh(qp, &qp->remote_ah_attr.grh, nwords); - lrh0 = IPS_LRH_GRH; + hwords += ipath_make_grh(dev, &hdr.u.l.grh, + &qp->remote_ah_attr.grh, + hwords, 0); + ohdr = &hdr.u.l.oth; + lrh0 = IPATH_LRH_GRH; } + /* read pkey_index w/o lock (its atomic) */ + bth0 = ipath_layer_get_pkey(dev->dd, qp->s_pkey_index); + if (qp->r_nak_state) + ohdr->u.aeth = cpu_to_be32((qp->r_msn & IPATH_MSN_MASK) | + (qp->r_nak_state << + IPATH_AETH_CREDIT_SHIFT)); + else + ohdr->u.aeth = ipath_compute_aeth(qp); + if (qp->r_ack_state >= OP(COMPARE_SWAP)) { + bth0 |= OP(ATOMIC_ACKNOWLEDGE) << 24; + ohdr->u.at.atomic_ack_eth = cpu_to_be64(qp->r_atomic_data); + hwords += sizeof(ohdr->u.at.atomic_ack_eth) / 4; + } else + bth0 |= OP(ACKNOWLEDGE) << 24; lrh0 |= qp->remote_ah_attr.sl << 4; - qp->s_hdr.lrh[0] = cpu_to_be16(lrh0); - qp->s_hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); - qp->s_hdr.lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords + - SIZE_OF_CRC); - qp->s_hdr.lrh[3] = cpu_to_be16(ipath_layer_get_lid(dev->dd)); - bth0 |= ipath_layer_get_pkey(dev->dd, qp->s_pkey_index); - bth0 |= extra_bytes << 20; + hdr.lrh[0] = cpu_to_be16(lrh0); + hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); + hdr.lrh[2] = cpu_to_be16(hwords + SIZE_OF_CRC); + hdr.lrh[3] = cpu_to_be16(ipath_layer_get_lid(dev->dd)); ohdr->bth[0] = cpu_to_be32(bth0); ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); - ohdr->bth[2] = cpu_to_be32(bth2); + ohdr->bth[2] = cpu_to_be32(qp->r_ack_psn & IPATH_PSN_MASK); - /* Check for more work to do. */ - goto again; + /* + * If we can send the ACK, clear the ACK state. + */ + if (ipath_verbs_send(dev->dd, hwords, (u32 *) &hdr, 0, NULL) == 0) { + qp->r_ack_state = OP(ACKNOWLEDGE); + dev->n_unicast_xmit++; + } else { + /* + * We are out of PIO buffers at the moment. + * Pass responsibility for sending the ACK to the + * send tasklet so that when a PIO buffer becomes + * available, the ACK is sent ahead of other outgoing + * packets. + */ + dev->n_rc_qacks++; + spin_lock_irq(&qp->s_lock); + /* Don't coalesce if a RDMA read or atomic is pending. */ + if (qp->s_ack_state == OP(ACKNOWLEDGE) || + qp->s_ack_state < OP(RDMA_READ_REQUEST)) { + qp->s_ack_state = qp->r_ack_state; + qp->s_nak_state = qp->r_nak_state; + qp->s_ack_psn = qp->r_ack_psn; + qp->r_ack_state = OP(ACKNOWLEDGE); + } + spin_unlock_irq(&qp->s_lock); -done: - spin_unlock_irqrestore(&qp->s_lock, flags); -clear: - clear_bit(IPATH_S_BUSY, &qp->s_flags); -bail: - return; + /* Call ipath_do_rc_send() in another thread. */ + tasklet_hi_schedule(&qp->s_task); + } } -static void send_rc_ack(struct ipath_qp *qp) +/** + * reset_psn - reset the QP state to send starting from PSN + * @qp: the QP + * @psn: the packet sequence number to restart at + * + * This is called from ipath_rc_rcv() to process an incoming RC ACK + * for the given QP. + * Called at interrupt level with the QP s_lock held. + */ +static void reset_psn(struct ipath_qp *qp, u32 psn) { - struct ipath_ibdev *dev = to_idev(qp->ibqp.device); - u16 lrh0; - u32 bth0; - struct ipath_other_headers *ohdr; + u32 n = qp->s_last; + struct ipath_swqe *wqe = get_swqe_ptr(qp, n); + u32 opcode; - /* Construct the header. */ - ohdr = &qp->s_hdr.u.oth; - lrh0 = IPS_LRH_BTH; - /* header size in 32-bit words LRH+BTH+AETH = (8+12+4)/4. */ - qp->s_hdrwords = 6; - if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { - ipath_make_rc_grh(qp, &qp->remote_ah_attr.grh, 0); - ohdr = &qp->s_hdr.u.l.oth; - lrh0 = IPS_LRH_GRH; + qp->s_cur = n; + + /* + * If we are starting the request from the beginning, + * let the normal send code handle initialization. + */ + if (ipath_cmp24(psn, wqe->psn) <= 0) { + qp->s_state = OP(SEND_LAST); + goto done; } - bth0 = ipath_layer_get_pkey(dev->dd, qp->s_pkey_index); - ohdr->u.aeth = ipath_compute_aeth(qp); - if (qp->s_ack_state >= OP(COMPARE_SWAP)) { - bth0 |= IB_OPCODE_ATOMIC_ACKNOWLEDGE << 24; - ohdr->u.at.atomic_ack_eth = cpu_to_be64(qp->s_ack_atomic); - qp->s_hdrwords += sizeof(ohdr->u.at.atomic_ack_eth) / 4; + + /* Find the work request opcode corresponding to the given PSN. */ + opcode = wqe->wr.opcode; + for (;;) { + int diff; + + if (++n == qp->s_size) + n = 0; + if (n == qp->s_tail) + break; + wqe = get_swqe_ptr(qp, n); + diff = ipath_cmp24(psn, wqe->psn); + if (diff < 0) + break; + qp->s_cur = n; + /* + * If we are starting the request from the beginning, + * let the normal send code handle initialization. + */ + if (diff == 0) { + qp->s_state = OP(SEND_LAST); + goto done; + } + opcode = wqe->wr.opcode; } - else - bth0 |= OP(ACKNOWLEDGE) << 24; - lrh0 |= qp->remote_ah_attr.sl << 4; - qp->s_hdr.lrh[0] = cpu_to_be16(lrh0); - qp->s_hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); - qp->s_hdr.lrh[2] = cpu_to_be16(qp->s_hdrwords + SIZE_OF_CRC); - qp->s_hdr.lrh[3] = cpu_to_be16(ipath_layer_get_lid(dev->dd)); - ohdr->bth[0] = cpu_to_be32(bth0); - ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); - ohdr->bth[2] = cpu_to_be32(qp->s_ack_psn & IPS_PSN_MASK); /* - * If we can send the ACK, clear the ACK state. + * Set the state to restart in the middle of a request. + * Don't change the s_sge, s_cur_sge, or s_cur_size. + * See ipath_do_rc_send(). */ - if (ipath_verbs_send(dev->dd, qp->s_hdrwords, (u32 *) &qp->s_hdr, - 0, NULL) == 0) { - qp->s_ack_state = OP(ACKNOWLEDGE); - dev->n_rc_qacks++; - dev->n_unicast_xmit++; + switch (opcode) { + case IB_WR_SEND: + case IB_WR_SEND_WITH_IMM: + qp->s_state = OP(RDMA_READ_RESPONSE_FIRST); + break; + + case IB_WR_RDMA_WRITE: + case IB_WR_RDMA_WRITE_WITH_IMM: + qp->s_state = OP(RDMA_READ_RESPONSE_LAST); + break; + + case IB_WR_RDMA_READ: + qp->s_state = OP(RDMA_READ_RESPONSE_MIDDLE); + break; + + default: + /* + * This case shouldn't happen since its only + * one PSN per req. + */ + qp->s_state = OP(SEND_LAST); } +done: + qp->s_psn = psn; } /** @@ -687,13 +681,12 @@ static void send_rc_ack(struct ipath_qp *qp) * @psn: packet sequence number for the request * @wc: the work completion request * - * The QP s_lock should be held. + * The QP s_lock should be held and interrupts disabled. */ void ipath_restart_rc(struct ipath_qp *qp, u32 psn, struct ib_wc *wc) { struct ipath_swqe *wqe = get_swqe_ptr(qp, qp->s_last); struct ipath_ibdev *dev; - u32 n; /* * If there are no requests pending, we are done. @@ -735,62 +728,7 @@ void ipath_restart_rc(struct ipath_qp *qp, u32 psn, struct ib_wc *wc) else dev->n_rc_resends += (int)qp->s_psn - (int)psn; - /* - * If we are starting the request from the beginning, let the normal - * send code handle initialization. - */ - qp->s_cur = qp->s_last; - if (ipath_cmp24(psn, wqe->psn) <= 0) { - qp->s_state = OP(SEND_LAST); - qp->s_psn = wqe->psn; - } else { - n = qp->s_cur; - for (;;) { - if (++n == qp->s_size) - n = 0; - if (n == qp->s_tail) { - if (ipath_cmp24(psn, qp->s_next_psn) >= 0) { - qp->s_cur = n; - wqe = get_swqe_ptr(qp, n); - } - break; - } - wqe = get_swqe_ptr(qp, n); - if (ipath_cmp24(psn, wqe->psn) < 0) - break; - qp->s_cur = n; - } - qp->s_psn = psn; - - /* - * Reset the state to restart in the middle of a request. - * Don't change the s_sge, s_cur_sge, or s_cur_size. - * See ipath_do_rc_send(). - */ - switch (wqe->wr.opcode) { - case IB_WR_SEND: - case IB_WR_SEND_WITH_IMM: - qp->s_state = OP(RDMA_READ_RESPONSE_FIRST); - break; - - case IB_WR_RDMA_WRITE: - case IB_WR_RDMA_WRITE_WITH_IMM: - qp->s_state = OP(RDMA_READ_RESPONSE_LAST); - break; - - case IB_WR_RDMA_READ: - qp->s_state = - OP(RDMA_READ_RESPONSE_MIDDLE); - break; - - default: - /* - * This case shouldn't happen since its only - * one PSN per req. - */ - qp->s_state = OP(SEND_LAST); - } - } + reset_psn(qp, psn); done: tasklet_hi_schedule(&qp->s_task); @@ -800,76 +738,14 @@ bail: } /** - * reset_psn - reset the QP state to send starting from PSN - * @qp: the QP - * @psn: the packet sequence number to restart at - * - * This is called from ipath_rc_rcv() to process an incoming RC ACK - * for the given QP. - * Called at interrupt level with the QP s_lock held. - */ -static void reset_psn(struct ipath_qp *qp, u32 psn) -{ - struct ipath_swqe *wqe; - u32 n; - - n = qp->s_cur; - wqe = get_swqe_ptr(qp, n); - for (;;) { - if (++n == qp->s_size) - n = 0; - if (n == qp->s_tail) { - if (ipath_cmp24(psn, qp->s_next_psn) >= 0) { - qp->s_cur = n; - wqe = get_swqe_ptr(qp, n); - } - break; - } - wqe = get_swqe_ptr(qp, n); - if (ipath_cmp24(psn, wqe->psn) < 0) - break; - qp->s_cur = n; - } - qp->s_psn = psn; - - /* - * Set the state to restart in the middle of a - * request. Don't change the s_sge, s_cur_sge, or - * s_cur_size. See ipath_do_rc_send(). - */ - switch (wqe->wr.opcode) { - case IB_WR_SEND: - case IB_WR_SEND_WITH_IMM: - qp->s_state = OP(RDMA_READ_RESPONSE_FIRST); - break; - - case IB_WR_RDMA_WRITE: - case IB_WR_RDMA_WRITE_WITH_IMM: - qp->s_state = OP(RDMA_READ_RESPONSE_LAST); - break; - - case IB_WR_RDMA_READ: - qp->s_state = OP(RDMA_READ_RESPONSE_MIDDLE); - break; - - default: - /* - * This case shouldn't happen since its only - * one PSN per req. - */ - qp->s_state = OP(SEND_LAST); - } -} - -/** * do_rc_ack - process an incoming RC ACK * @qp: the QP the ACK came in on * @psn: the packet sequence number of the ACK * @opcode: the opcode of the request that resulted in the ACK * - * This is called from ipath_rc_rcv() to process an incoming RC ACK + * This is called from ipath_rc_rcv_resp() to process an incoming RC ACK * for the given QP. - * Called at interrupt level with the QP s_lock held. + * Called at interrupt level with the QP s_lock held and interrupts disabled. * Returns 1 if OK, 0 if current operation should be aborted (NAK). */ static int do_rc_ack(struct ipath_qp *qp, u32 aeth, u32 psn, int opcode) @@ -1006,26 +882,16 @@ static int do_rc_ack(struct ipath_qp *qp, u32 aeth, u32 psn, int opcode) if (qp->s_last == qp->s_tail) goto bail; - /* The last valid PSN seen is the previous request's. */ - qp->s_last_psn = wqe->psn - 1; + /* The last valid PSN is the previous PSN. */ + qp->s_last_psn = psn - 1; dev->n_rc_resends += (int)qp->s_psn - (int)psn; - /* - * If we are starting the request from the beginning, let - * the normal send code handle initialization. - */ - qp->s_cur = qp->s_last; - wqe = get_swqe_ptr(qp, qp->s_cur); - if (ipath_cmp24(psn, wqe->psn) <= 0) { - qp->s_state = OP(SEND_LAST); - qp->s_psn = wqe->psn; - } else - reset_psn(qp, psn); + reset_psn(qp, psn); qp->s_rnr_timeout = - ib_ipath_rnr_table[(aeth >> IPS_AETH_CREDIT_SHIFT) & - IPS_AETH_CREDIT_MASK]; + ib_ipath_rnr_table[(aeth >> IPATH_AETH_CREDIT_SHIFT) & + IPATH_AETH_CREDIT_MASK]; ipath_insert_rnr_queue(qp); goto bail; @@ -1033,8 +899,8 @@ static int do_rc_ack(struct ipath_qp *qp, u32 aeth, u32 psn, int opcode) /* The last valid PSN seen is the previous request's. */ if (qp->s_last != qp->s_tail) qp->s_last_psn = wqe->psn - 1; - switch ((aeth >> IPS_AETH_CREDIT_SHIFT) & - IPS_AETH_CREDIT_MASK) { + switch ((aeth >> IPATH_AETH_CREDIT_SHIFT) & + IPATH_AETH_CREDIT_MASK) { case 0: /* PSN sequence error */ dev->n_seq_naks++; /* @@ -1182,32 +1048,33 @@ static inline void ipath_rc_rcv_resp(struct ipath_ibdev *dev, goto ack_done; } rdma_read: - if (unlikely(qp->s_state != OP(RDMA_READ_REQUEST))) - goto ack_done; - if (unlikely(tlen != (hdrsize + pmtu + 4))) - goto ack_done; - if (unlikely(pmtu >= qp->s_len)) - goto ack_done; - /* We got a response so update the timeout. */ - if (unlikely(qp->s_last == qp->s_tail || - get_swqe_ptr(qp, qp->s_last)->wr.opcode != - IB_WR_RDMA_READ)) - goto ack_done; - spin_lock(&dev->pending_lock); - if (qp->s_rnr_timeout == 0 && !list_empty(&qp->timerwait)) - list_move_tail(&qp->timerwait, - &dev->pending[dev->pending_index]); - spin_unlock(&dev->pending_lock); - /* - * Update the RDMA receive state but do the copy w/o holding the - * locks and blocking interrupts. XXX Yet another place that - * affects relaxed RDMA order since we don't want s_sge modified. - */ - qp->s_len -= pmtu; - qp->s_last_psn = psn; - spin_unlock_irqrestore(&qp->s_lock, flags); - ipath_copy_sge(&qp->s_sge, data, pmtu); - goto bail; + if (unlikely(qp->s_state != OP(RDMA_READ_REQUEST))) + goto ack_done; + if (unlikely(tlen != (hdrsize + pmtu + 4))) + goto ack_done; + if (unlikely(pmtu >= qp->s_len)) + goto ack_done; + /* We got a response so update the timeout. */ + if (unlikely(qp->s_last == qp->s_tail || + get_swqe_ptr(qp, qp->s_last)->wr.opcode != + IB_WR_RDMA_READ)) + goto ack_done; + spin_lock(&dev->pending_lock); + if (qp->s_rnr_timeout == 0 && !list_empty(&qp->timerwait)) + list_move_tail(&qp->timerwait, + &dev->pending[dev->pending_index]); + spin_unlock(&dev->pending_lock); + /* + * Update the RDMA receive state but do the copy w/o + * holding the locks and blocking interrupts. + * XXX Yet another place that affects relaxed RDMA order + * since we don't want s_sge modified. + */ + qp->s_len -= pmtu; + qp->s_last_psn = psn; + spin_unlock_irqrestore(&qp->s_lock, flags); + ipath_copy_sge(&qp->s_sge, data, pmtu); + goto bail; case OP(RDMA_READ_RESPONSE_LAST): /* ACKs READ req. */ @@ -1230,18 +1097,12 @@ static inline void ipath_rc_rcv_resp(struct ipath_ibdev *dev, * ICRC (4). */ if (unlikely(tlen <= (hdrsize + pad + 8))) { - /* - * XXX Need to generate an error CQ - * entry. - */ + /* XXX Need to generate an error CQ entry. */ goto ack_done; } tlen -= hdrsize + pad + 8; if (unlikely(tlen != qp->s_len)) { - /* - * XXX Need to generate an error CQ - * entry. - */ + /* XXX Need to generate an error CQ entry. */ goto ack_done; } if (!header_in_data) @@ -1254,9 +1115,12 @@ static inline void ipath_rc_rcv_resp(struct ipath_ibdev *dev, if (do_rc_ack(qp, aeth, psn, OP(RDMA_READ_RESPONSE_LAST))) { /* * Change the state so we contimue - * processing new requests. + * processing new requests and wake up the + * tasklet if there are posted sends. */ qp->s_state = OP(SEND_LAST); + if (qp->s_tail != qp->s_head) + tasklet_hi_schedule(&qp->s_task); } goto ack_done; } @@ -1302,18 +1166,16 @@ static inline int ipath_rc_rcv_error(struct ipath_ibdev *dev, * Don't queue the NAK if a RDMA read, atomic, or * NAK is pending though. */ - spin_lock(&qp->s_lock); - if ((qp->s_ack_state >= OP(RDMA_READ_REQUEST) && - qp->s_ack_state != IB_OPCODE_ACKNOWLEDGE) || - qp->s_nak_state != 0) { - spin_unlock(&qp->s_lock); + if (qp->s_ack_state != OP(ACKNOWLEDGE) || + qp->r_nak_state != 0) goto done; + if (qp->r_ack_state < OP(COMPARE_SWAP)) { + qp->r_ack_state = OP(SEND_ONLY); + qp->r_nak_state = IB_NAK_PSN_ERROR; + /* Use the expected PSN. */ + qp->r_ack_psn = qp->r_psn; } - qp->s_ack_state = OP(SEND_ONLY); - qp->s_nak_state = IB_NAK_PSN_ERROR; - /* Use the expected PSN. */ - qp->s_ack_psn = qp->r_psn; - goto resched; + goto send_ack; } /* @@ -1327,27 +1189,7 @@ static inline int ipath_rc_rcv_error(struct ipath_ibdev *dev, * send the earliest so that RDMA reads can be restarted at * the requester's expected PSN. */ - spin_lock(&qp->s_lock); - if (qp->s_ack_state != IB_OPCODE_ACKNOWLEDGE && - ipath_cmp24(psn, qp->s_ack_psn) >= 0) { - if (qp->s_ack_state < IB_OPCODE_RDMA_READ_REQUEST) - qp->s_ack_psn = psn; - spin_unlock(&qp->s_lock); - goto done; - } - switch (opcode) { - case OP(RDMA_READ_REQUEST): - /* - * We have to be careful to not change s_rdma_sge - * while ipath_do_rc_send() is using it and not - * holding the s_lock. - */ - if (qp->s_ack_state != OP(ACKNOWLEDGE) && - qp->s_ack_state >= IB_OPCODE_RDMA_READ_REQUEST) { - spin_unlock(&qp->s_lock); - dev->n_rdma_dup_busy++; - goto done; - } + if (opcode == OP(RDMA_READ_REQUEST)) { /* RETH comes after BTH */ if (!header_in_data) reth = &ohdr->u.rc.reth; @@ -1355,6 +1197,22 @@ static inline int ipath_rc_rcv_error(struct ipath_ibdev *dev, reth = (struct ib_reth *)data; data += sizeof(*reth); } + /* + * If we receive a duplicate RDMA request, it means the + * requester saw a sequence error and needs to restart + * from an earlier point. We can abort the current + * RDMA read send in that case. + */ + spin_lock_irq(&qp->s_lock); + if (qp->s_ack_state != OP(ACKNOWLEDGE) && + (qp->s_hdrwords || ipath_cmp24(psn, qp->s_ack_psn) >= 0)) { + /* + * We are already sending earlier requested data. + * Don't abort it to send later out of sequence data. + */ + spin_unlock_irq(&qp->s_lock); + goto done; + } qp->s_rdma_len = be32_to_cpu(reth->length); if (qp->s_rdma_len != 0) { u32 rkey = be32_to_cpu(reth->rkey); @@ -1368,8 +1226,10 @@ static inline int ipath_rc_rcv_error(struct ipath_ibdev *dev, ok = ipath_rkey_ok(dev, &qp->s_rdma_sge, qp->s_rdma_len, vaddr, rkey, IB_ACCESS_REMOTE_READ); - if (unlikely(!ok)) + if (unlikely(!ok)) { + spin_unlock_irq(&qp->s_lock); goto done; + } } else { qp->s_rdma_sge.sg_list = NULL; qp->s_rdma_sge.num_sge = 0; @@ -1378,25 +1238,44 @@ static inline int ipath_rc_rcv_error(struct ipath_ibdev *dev, qp->s_rdma_sge.sge.length = 0; qp->s_rdma_sge.sge.sge_length = 0; } - break; + qp->s_ack_state = opcode; + qp->s_ack_psn = psn; + spin_unlock_irq(&qp->s_lock); + tasklet_hi_schedule(&qp->s_task); + goto send_ack; + } + + /* + * A pending RDMA read will ACK anything before it so + * ignore earlier duplicate requests. + */ + if (qp->s_ack_state != OP(ACKNOWLEDGE)) + goto done; + /* + * If an ACK is pending, don't replace the pending ACK + * with an earlier one since the later one will ACK the earlier. + * Also, if we already have a pending atomic, send it. + */ + if (qp->r_ack_state != OP(ACKNOWLEDGE) && + (ipath_cmp24(psn, qp->r_ack_psn) <= 0 || + qp->r_ack_state >= OP(COMPARE_SWAP))) + goto send_ack; + switch (opcode) { case OP(COMPARE_SWAP): case OP(FETCH_ADD): /* - * Check for the PSN of the last atomic operations + * Check for the PSN of the last atomic operation * performed and resend the result if found. */ - if ((psn & IPS_PSN_MASK) != qp->r_atomic_psn) { - spin_unlock(&qp->s_lock); + if ((psn & IPATH_PSN_MASK) != qp->r_atomic_psn) goto done; - } - qp->s_ack_atomic = qp->r_atomic_data; break; } - qp->s_ack_state = opcode; - qp->s_nak_state = 0; - qp->s_ack_psn = psn; -resched: + qp->r_ack_state = opcode; + qp->r_nak_state = 0; + qp->r_ack_psn = psn; +send_ack: return 0; done: @@ -1424,7 +1303,6 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr, u32 hdrsize; u32 psn; u32 pad; - unsigned long flags; struct ib_wc wc; u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu); int diff; @@ -1453,11 +1331,6 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr, } else psn = be32_to_cpu(ohdr->bth[2]); } - /* - * The opcode is in the low byte when its in network order - * (top byte when in host order). - */ - opcode = be32_to_cpu(ohdr->bth[0]) >> 24; /* * Process responses (ACKs) before anything else. Note that the @@ -1465,22 +1338,21 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr, * queue rather than the expected receive packet sequence number. * In other words, this QP is the requester. */ + opcode = be32_to_cpu(ohdr->bth[0]) >> 24; if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) && opcode <= OP(ATOMIC_ACKNOWLEDGE)) { ipath_rc_rcv_resp(dev, ohdr, data, tlen, qp, opcode, psn, hdrsize, pmtu, header_in_data); - goto bail; + goto done; } - spin_lock_irqsave(&qp->r_rq.lock, flags); - /* Compute 24 bits worth of difference. */ diff = ipath_cmp24(psn, qp->r_psn); if (unlikely(diff)) { if (ipath_rc_rcv_error(dev, ohdr, data, qp, opcode, psn, diff, header_in_data)) goto done; - goto resched; + goto send_ack; } /* Check for opcode sequence errors. */ @@ -1492,22 +1364,19 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr, opcode == OP(SEND_LAST_WITH_IMMEDIATE)) break; nack_inv: - /* - * A NAK will ACK earlier sends and RDMA writes. Don't queue the - * NAK if a RDMA read, atomic, or NAK is pending though. - */ - spin_lock(&qp->s_lock); - if (qp->s_ack_state >= OP(RDMA_READ_REQUEST) && - qp->s_ack_state != IB_OPCODE_ACKNOWLEDGE) { - spin_unlock(&qp->s_lock); - goto done; - } - /* XXX Flush WQEs */ - qp->state = IB_QPS_ERR; - qp->s_ack_state = OP(SEND_ONLY); - qp->s_nak_state = IB_NAK_INVALID_REQUEST; - qp->s_ack_psn = qp->r_psn; - goto resched; + /* + * A NAK will ACK earlier sends and RDMA writes. + * Don't queue the NAK if a RDMA read, atomic, or NAK + * is pending though. + */ + if (qp->r_ack_state >= OP(COMPARE_SWAP)) + goto send_ack; + /* XXX Flush WQEs */ + qp->state = IB_QPS_ERR; + qp->r_ack_state = OP(SEND_ONLY); + qp->r_nak_state = IB_NAK_INVALID_REQUEST; + qp->r_ack_psn = qp->r_psn; + goto send_ack; case OP(RDMA_WRITE_FIRST): case OP(RDMA_WRITE_MIDDLE): @@ -1517,20 +1386,6 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr, break; goto nack_inv; - case OP(RDMA_READ_REQUEST): - case OP(COMPARE_SWAP): - case OP(FETCH_ADD): - /* - * Drop all new requests until a response has been sent. A - * new request then ACKs the RDMA response we sent. Relaxed - * ordering would allow new requests to be processed but we - * would need to keep a queue of rwqe's for all that are in - * progress. Note that we can't RNR NAK this request since - * the RDMA READ or atomic response is already queued to be - * sent (unless we implement a response send queue). - */ - goto done; - default: if (opcode == OP(SEND_MIDDLE) || opcode == OP(SEND_LAST) || @@ -1539,6 +1394,11 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr, opcode == OP(RDMA_WRITE_LAST) || opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) goto nack_inv; + /* + * Note that it is up to the requester to not send a new + * RDMA read or atomic operation before receiving an ACK + * for the previous operation. + */ break; } @@ -1555,17 +1415,12 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr, * Don't queue the NAK if a RDMA read or atomic * is pending though. */ - spin_lock(&qp->s_lock); - if (qp->s_ack_state >= - OP(RDMA_READ_REQUEST) && - qp->s_ack_state != IB_OPCODE_ACKNOWLEDGE) { - spin_unlock(&qp->s_lock); - goto done; - } - qp->s_ack_state = OP(SEND_ONLY); - qp->s_nak_state = IB_RNR_NAK | qp->s_min_rnr_timer; - qp->s_ack_psn = qp->r_psn; - goto resched; + if (qp->r_ack_state >= OP(COMPARE_SWAP)) + goto send_ack; + qp->r_ack_state = OP(SEND_ONLY); + qp->r_nak_state = IB_RNR_NAK | qp->r_min_rnr_timer; + qp->r_ack_psn = qp->r_psn; + goto send_ack; } qp->r_rcv_len = 0; /* FALLTHROUGH */ @@ -1622,7 +1477,7 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr, if (unlikely(wc.byte_len > qp->r_len)) goto nack_inv; ipath_copy_sge(&qp->r_sge, data, tlen); - atomic_inc(&qp->msn); + qp->r_msn++; if (opcode == OP(RDMA_WRITE_LAST) || opcode == OP(RDMA_WRITE_ONLY)) break; @@ -1666,29 +1521,8 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr, ok = ipath_rkey_ok(dev, &qp->r_sge, qp->r_len, vaddr, rkey, IB_ACCESS_REMOTE_WRITE); - if (unlikely(!ok)) { - nack_acc: - /* - * A NAK will ACK earlier sends and RDMA - * writes. Don't queue the NAK if a RDMA - * read, atomic, or NAK is pending though. - */ - spin_lock(&qp->s_lock); - if (qp->s_ack_state >= - OP(RDMA_READ_REQUEST) && - qp->s_ack_state != - IB_OPCODE_ACKNOWLEDGE) { - spin_unlock(&qp->s_lock); - goto done; - } - /* XXX Flush WQEs */ - qp->state = IB_QPS_ERR; - qp->s_ack_state = OP(RDMA_WRITE_ONLY); - qp->s_nak_state = - IB_NAK_REMOTE_ACCESS_ERROR; - qp->s_ack_psn = qp->r_psn; - goto resched; - } + if (unlikely(!ok)) + goto nack_acc; } else { qp->r_sge.sg_list = NULL; qp->r_sge.sge.mr = NULL; @@ -1715,12 +1549,10 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr, reth = (struct ib_reth *)data; data += sizeof(*reth); } - spin_lock(&qp->s_lock); - if (qp->s_ack_state != OP(ACKNOWLEDGE) && - qp->s_ack_state >= IB_OPCODE_RDMA_READ_REQUEST) { - spin_unlock(&qp->s_lock); - goto done; - } + if (unlikely(!(qp->qp_access_flags & + IB_ACCESS_REMOTE_READ))) + goto nack_acc; + spin_lock_irq(&qp->s_lock); qp->s_rdma_len = be32_to_cpu(reth->length); if (qp->s_rdma_len != 0) { u32 rkey = be32_to_cpu(reth->rkey); @@ -1732,7 +1564,7 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr, qp->s_rdma_len, vaddr, rkey, IB_ACCESS_REMOTE_READ); if (unlikely(!ok)) { - spin_unlock(&qp->s_lock); + spin_unlock_irq(&qp->s_lock); goto nack_acc; } /* @@ -1749,21 +1581,25 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr, qp->s_rdma_sge.sge.length = 0; qp->s_rdma_sge.sge.sge_length = 0; } - if (unlikely(!(qp->qp_access_flags & - IB_ACCESS_REMOTE_READ))) - goto nack_acc; /* * We need to increment the MSN here instead of when we * finish sending the result since a duplicate request would * increment it more than once. */ - atomic_inc(&qp->msn); + qp->r_msn++; + qp->s_ack_state = opcode; - qp->s_nak_state = 0; qp->s_ack_psn = psn; + spin_unlock_irq(&qp->s_lock); + qp->r_psn++; qp->r_state = opcode; - goto rdmadone; + qp->r_nak_state = 0; + + /* Call ipath_do_rc_send() in another thread. */ + tasklet_hi_schedule(&qp->s_task); + + goto done; case OP(COMPARE_SWAP): case OP(FETCH_ADD): { @@ -1792,7 +1628,7 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr, goto nack_acc; /* Perform atomic OP and save result. */ sdata = be64_to_cpu(ateth->swap_data); - spin_lock(&dev->pending_lock); + spin_lock_irq(&dev->pending_lock); qp->r_atomic_data = *(u64 *) qp->r_sge.sge.vaddr; if (opcode == OP(FETCH_ADD)) *(u64 *) qp->r_sge.sge.vaddr = @@ -1800,9 +1636,9 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr, else if (qp->r_atomic_data == be64_to_cpu(ateth->compare_data)) *(u64 *) qp->r_sge.sge.vaddr = sdata; - spin_unlock(&dev->pending_lock); - atomic_inc(&qp->msn); - qp->r_atomic_psn = psn & IPS_PSN_MASK; + spin_unlock_irq(&dev->pending_lock); + qp->r_msn++; + qp->r_atomic_psn = psn & IPATH_PSN_MASK; psn |= 1 << 31; break; } @@ -1813,44 +1649,39 @@ void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr, } qp->r_psn++; qp->r_state = opcode; + qp->r_nak_state = 0; /* Send an ACK if requested or required. */ if (psn & (1 << 31)) { /* * Coalesce ACKs unless there is a RDMA READ or * ATOMIC pending. */ - spin_lock(&qp->s_lock); - if (qp->s_ack_state == OP(ACKNOWLEDGE) || - qp->s_ack_state < IB_OPCODE_RDMA_READ_REQUEST) { - qp->s_ack_state = opcode; - qp->s_nak_state = 0; - qp->s_ack_psn = psn; - qp->s_ack_atomic = qp->r_atomic_data; - goto resched; + if (qp->r_ack_state < OP(COMPARE_SWAP)) { + qp->r_ack_state = opcode; + qp->r_ack_psn = psn; } - spin_unlock(&qp->s_lock); + goto send_ack; } -done: - spin_unlock_irqrestore(&qp->r_rq.lock, flags); - goto bail; + goto done; -resched: +nack_acc: /* - * Try to send ACK right away but not if ipath_do_rc_send() is - * active. + * A NAK will ACK earlier sends and RDMA writes. + * Don't queue the NAK if a RDMA read, atomic, or NAK + * is pending though. */ - if (qp->s_hdrwords == 0 && - (qp->s_ack_state < IB_OPCODE_RDMA_READ_REQUEST || - qp->s_ack_state >= IB_OPCODE_COMPARE_SWAP)) + if (qp->r_ack_state < OP(COMPARE_SWAP)) { + /* XXX Flush WQEs */ + qp->state = IB_QPS_ERR; + qp->r_ack_state = OP(RDMA_WRITE_ONLY); + qp->r_nak_state = IB_NAK_REMOTE_ACCESS_ERROR; + qp->r_ack_psn = qp->r_psn; + } +send_ack: + /* Send ACK right away unless the send tasklet has a pending ACK. */ + if (qp->s_ack_state == OP(ACKNOWLEDGE)) send_rc_ack(qp); -rdmadone: - spin_unlock(&qp->s_lock); - spin_unlock_irqrestore(&qp->r_rq.lock, flags); - - /* Call ipath_do_rc_send() in another thread. */ - tasklet_hi_schedule(&qp->s_task); - -bail: +done: return; } |